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Up to now, various compressor models for automotive air conditioners have been manufactured to answer the needs of car manufacturers for fuel economy and quietness. The 10PC20 compressor, developed for automotive air conditioners, is the world's first swash plate type compressor having a continuously variable displacement mechanism. The 10PC20 is aimed at realizing a large displacement compressor with a continuously variable displacement mechanism, which has not been achieved until today. To achieve this goal, the 10PC20 design is based on the swash plate type compressor, consisting of double-headed pistons, which is adaptable to a large displacement and has excellent rotating balance and durability. The 10PC20 changes its displacement continuously by changing the inclination of the swash plate (swash plate angle) continuously. (See photo. 1 and 2) The 10PC20 adopts two variable displacement principles.

The A/C compressor installed in the Toyota cars on sale in the Japanese market since August 1983, has adopted the variable displacement control method, and as a result, both comfort and power saving have been obtained. The compressor called “Two-stage variable displacement type A/C Compressor (10P-V)” is based upon the swash-plate type compressor, with ten cylinders to the front and rear of the cylinder block, and is constructed with a two mode choice. In the first, high load cooling is carried out (100% displacement) with all the cylinders operating. In the second, low load cooling is carried out (50% displacement) with the five cylinders in front operating while the discharge valves of the five rear cylinders are unloaded.